Biology Exam Paper Questions And Answers (Verified Answers) Best For 2024 Exam

The figures below illustrate the similarities between ATP synthesis in mitochondria and chloroplasts. {Ans: (A) Do electron transport chains create a gradient so that ATP synthase can generate ATP molecules?}The illustration above depicts a neuromuscular junction of a patient with an autoimmune disorder. Acetylcholine is a stimulatory neurotransmitter. Which of the following would be the most likely result of the continued presence of the antibody? {Ans: (B) A decrease in action potentials in the muscle, causing muscle weakness and fatigue}Which of the following best supports the hypothesis that the difference in leaf color is genetically controlled? {Ans: (D) The existence of yellow-leaved seedlings as well as green-leaved ones on day 14 in dish B}The biologist discovered that from 1988 to 1993, the average beak size declined to pre-1981 levels. The reversal in beak size from 1988 to 1993 was most likely related to which of the following events? {Ans: (B) The end of the drought}Sickle-cell anemia results from a point mutation in the HBB gene. The mutation results in the replacement of an amino acid that has a hydrophilic R-group with an amino acid that has a hydrophobic R-group on the exterior of the hemoglobin protein.